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MA <br /> .� August 6, 1991 <br /> ARCO Station No.549 <br /> o Develop, purge and sample the ground-water monitoring wells. <br /> amples to a certified laboratory approved by ARCO. <br /> o Submit soil and water s <br /> The soil sample collected just above the saturated zone and the sample having <br /> the highest PID reading will be submitted. If the soil sample from just above `? <br /> the saturated zone has the highest PID reading,then the soil sample having <br /> the next highest PID reading will be submitted for chemical analyses. <br /> �• <br /> o Analyze soil samples for TPHg and BTEX compounds. In addition, soil <br /> samples collected from the boring near the waste-oil tank cavity will be <br /> analyzed for total petroleum hydrocarbons as diesel (TPHd), total oil and <br /> tile organic compounds (VOC), and total cadmium, <br /> grease (TOG), vola <br /> chromium, nickel, lead, and zinc. <br /> O Analyze water samples for TPHg and BTEX compounds. In addition, the <br /> aste-oil tank cavity will be analyzed for Qa,( <br /> water sample collected near the w <br /> TPHd, TOG, and VOC. <br /> o Contract a licensed surveyor to survey the wells with respect to mean sea <br /> level. <br /> o Evaluate the groundwater gradient beneath the site. <br /> r y o Collect samples of the drill cuttings stockpiled onsite and submit tho samples <br /> to an ARCO-approved laboratory. Results of these analyses will be used to <br /> e soil. We will apprise ARCO of these <br /> evaluate disposal options for th <br /> options. <br /> ry Investigation and Evaluation Report in accordance with <br /> o Prepare a Prelimina <br /> California Regional Waand ter �nclusionsuality ontrol Board obased on previous and proposed <br /> summarizing our finding <br /> work. <br /> �� AGS 30004-4 6 <br />